Electrical heating unit and method of making same



M. SIMON ELECTRICAL HEATING UNI'l AND METHOD OF MAKING SAME Oct. 6, 1925.

Filed April 25. 1921 l 7 #flag/wp( Y heated.

' cylindrical shape.

Patented Oct. 1925.

MAURICE SIMN, F

ST. LUIS, MISSURT.

ELECTRICAL HEATING UNIT AND METHOB 0F MARN@ SAME.

Application filed april 2255,

To all whom it' may; concern.'

Be it known that E, Mannion SIMON, a citizen of the United States, residing' the city of St. Louis, in the State ot Missouri., have invented a certain new and useful Electrical Heating Unit and Method of Maltu ing Same, of which the following is a clear, full, and exact description, such as will en able others skilled in the art to maire and use the same.

v My invention consists in the construction and arrangement of parts hereinafter described andV particularly pointed out the claims.` In describing the various arrangements employed and shown in the drawings hereto attached and described the specification, l do not limit my invention y to the precise form or construction of apparatus shown, or the several parts thereto, inasrnuch as various alterations may be made without changing the scope of my invention.

The object of my invention is to provide a compact, easily assembled and economically constructed electrical heating unit having sufficient resiliency to make effective thermal contact when the heating unit is inserted within or placed around an object to be This application, among other things, relates to the making of a circular or cylindrical hea-tingv unit whose casing preferably has a compensating contour or excess ortion to permit forming same into rlhis application shows a heating unit-whose casing makes eiieetive contact with a body to be heated. time this application was tiled l tiled cation Serial No. etLQOQ, which relates f electrical heating units controlied by sp and Serial No. 464,203, relating hear" units controlled by manual means.

in the drawings, i is a view showing a resistance unit embodying my inver a portion of the view being broken to show longitudinally extending resistance wire insulation therefor. Fig. 2 is a cross sectional view of the heating unit shown in 3 is alongitudinal section showinn preferred arrangement of terminals. i shows a similar resistance unit having p tions broken out to illustrate a transverse section and also an arrangement the terminals. Fis. 5 is a cross section showing a resistance element in the. tube that has b i iiattened'out. Fig. 6 shows my inve applied to resistance unit of tapered im n. 'l is a cross sectiony showing the enclosed Serial No. ll.

casing made `from a sheet instead or" a tube.

ln the drawings l0 is a casing preferably rnade of a heat conducting material, such as copper. insi tion as shown, l use for a casing a heat conducting tube preferably of copper. rlFhis cas is preferably of a metal which 1s hard PJh to stand repeated insertions in and 'e removals from the article to be heated without encessive wear on the casing. l: prefer to m. :e this casing ot a seamless tube oi copper i ther than from a tube having a seam.

Ey using a seamless tube the heat received at the various parts of the casing is conducted evenly with a minimum of loss to the object to heated. However, l do not limit myself 'to the use of a seamless tube tor casings. is shown in Fig. 5, the tube has been lattened out and the electrical resistor properly insulated has been positioned within the iiattened tube. l thereupon torni the flattened tube into an open seam cylinder and in so doing l compress the walls of the casing aginst the insulated resistor within. The ends are preferably lett with a diameter greater than the distance between the tlattened walls ll and l2. By having these enends the flattened tube may be formed ini' i a. member of circular or prismatic cross section, without the metal in 'the outside wall l? being brokenor unduly stretched.

l method ot making these units is pre- :t l .bly to ilatten a tube of lhigh heat conng material and when the tube has been utly flattened to insert an insulated resistor therein and thereafter form the iiatl tube upon a mandrel or other suitable nine, into an open scam cylinder, ot' de* ed cross section. lt is obvious, however, may torni the tubeinto an open seam cylinand then insert the insulated resistor and after compress the walls ot the cylinder hold the insulated resistor under session. is desirable that the walls ot the casing shall subject the insulation to pressure. it likewise desirable that the casing walls 2 v @senese shall be as close as is safely permissible to element into an open seamed member and the resistor because thereby the heat from the t reafter compressing a suitably insulated 55 resistor is the more readily conducted te the electrical resistor therein.

casino. By the use of' the continuous casin` An electrical heating unit comprising of good heat conducting material the heat an electrical resistor and a casing of lernele, generated by the unit is conducted te the material g the form oit' object to be heated.. it this heating unit be inserted Within an aperture-the heat received by the inside Wall il is conducted around te 60 mprising i fie i *e the outside Wall and When ,the resistance unit to is placed about an obgectto be heated tlieneat e; ider pressed delivered to the outside wail, in t ii conducted around to the inside Wala open seam cylindrical arrangement pe the operator to press the closed ends togen;i in inserting the unit into an aperture, a when the unit is placed around an object te be heated the closed ends will be moved er v Wardly, and the resiliency of the casing .rili in each instance cause the casing to malte a viese ruit thermal-contact with the material to be ed. lt is obvious that l may use a flat sheet of metal and -fold it over form a closed ance un M "l cenipensate for the iliilfef= ier er and shorter iafes a resi, or cemjgressed i walls si: casing tr the resist-er it; eted to the o esistance n` 'ir-ring its casing preferably soldering or brazing the s permit :ertai edges of the metal as shown in Fig. 7. lifi/nie devenant tween the unit iste t l have shown the flap at one of the end the unit it is preferable to place the ,tl a point intermediate the ends, either er outside and to tlius make the casi practically continuous heat conductor maintain trie resiliency oi' the open s cylinder it is desirable to solder or edges or" the metal. l do not restrict n yention to a cylindrical constructien cing unit because my invention may Y esistor be rendir;A

"'e cembinatien er a resilient contin: S5 e i "led r ,g s in e me plied to heating units of Various 'forms f'. t et asinuch as a high temperature is obte with these heating units, prefer te u f resilient element or spring made of ir rial whose resiliency Wiii not be. impair-et. destroyed *when subjiected to repeated temperatures.

l claim:

l. The iiereinbefore described niet making electrical i units l i f sists in plz conduct-nw element a ir-"ical heatiir" ing s ucli member resilient open inernben The hereinbe-'tere described making ele ficai eat' units sists in forming a se ons beat sister2 a i". ii resistor., :a

une res me 

